Plex/Nine is available for download as of midnight EST. For those who don't know, it's a OS X based media center suite.
This version is a complete rewrite of what was originally a fork of XBMC. Amongst the excellent things coming with this version is a universal iOS app that works as a remote and provides media access to your library over WiFi and 3G.
I plan to download ASAP and check it out.
Website
Lead Developer Blog
coverage on CrunchGear (annoying guy, but good overview on the video)